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A. P'. MEAD. STEAM GENERATOR.

No. 468,884. Patented Feb. 16, 1892.

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A.P.MEAD. STEAMGENBRATOR.

180,488,884. 'Patented Feu-16, 1892.

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UNiTnn STATES A PATENT OFFICE,

ARTHUR F. MEAD, OF NEV YORK, N. Y.

STEAM-G EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 468,884, dated February 16, 1892.

Appnmion flied April 15, 1891;

To a/ZZ whom, it may concern:

Be it known that l, ARTHUR F. MEAD, a citizen of the United States, and a resident of New York, county and State of New York, have invented a certain new and useful Improvement in Steam-Generators, of which the following is a speciiication.

My invention relates to steam-generating apparatuses, and has for its object the provision of a generator which is simple in construction, inexpensive in manufacture, easily taken care of, and which is efficient in practical use.

To attain the desired end my invention consists in the construct-ion and arrangement of parts hereinafter first fully described, and then pointed out in the claims.

In the drawings which form a part of this specification, Figure 1 represents a vertical section of my steam-generator; Fig. 2, a transverse section on the line a: Fig. l. Fig. 3 is a detail view of a section of my sleeve-lining, and Fig. 4 is a sectional View of the lower portion of one of my water-legs.

Like letters of reference wherever they occur indicate corresponding parts in all the figures.

Referring again to the drawings, A represents my generator proper, consisting of a steam and water reservoir or body provided with a series of supporting water legs or pipes a communicating therewith. The body of the generator A is constructed ordinarily of wrought-iron riveted together, a strengthening-band A being applied to the lower portion of the same. A series of holes made to offset each other serve to contain elbows d', into which elbows are screwed the independent vertical water-legs af. By this arri-ange` ment the single row of pipes d, of two or more lengths, may be placed close to each other without weakening the body A to any considerable extent. The vertical water-legs a extend, as stated, almost entirely around the lower portion of the body A and, depending therefrom, form a chamber, which I designate as a fire-box D, sufficient space, however, being left bare or devoid of pipes in order to afford a provision for the admission of fuel into the same. The water-legs a are provided at their lower extremities with caps @Sand serve to contain independent pieces of pipe a2,

Serial No. 389,006. (No model.)

shorter than the water-legs a and provided with an uneven edge, or being diagonally cut across at the lower end of the same, so as to thereof and is provided with a countersunk hole f2, into which is placed a boltf, which serves, in connection with the washer or nut H', to fasten the sleeve F to the water-legs a, projections f3, located on the back of each section, assisting to keep the same in position, and grooves f4, placed in the lower inside corners thereof, allowing room for the caps a3 of the water-legs, in order that the lining F may stand closely adjacent to the pipes a. The side edges of each of the sections of the sleeve F, which sections are preferably provided with longitudinal ribs f6, in order both to impart greater strength to the same and to prevent the body of hot coal lying too close to the same, may be beveled to a greater or less degree, in order that the sectional sleeve F shall conform to the size of the circle required. 4

The function of the sectional sleeve or lining F is fourfold:l First, it protects the fire from the chill of the water-legs, thus making good combustion in a small tire-box; second, it protects the lower ends of the water-legs from too great a heat, which has a tendency to drive the water up out of the bottom of the water-legs; third, it throws the intensity of the fire up from the bottom of the waterlegs, the waterbeing thus heated the hottest between the inside and outside pipes a2 ct some distance above the bottom, and, thus rising, it afterward flows down again through the inside circulating-pipe a2, by this means creating a constant current of water; fourth, in case the generator is allowed t0 run dry and get red hot, or even white hot, around the fire-box, no serious damage would necessarily be done to the generator.

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In the latter case, however, the sectional sleeve F would be apt to b e burned out, which lining could be readily replaced, as before mentioned, without disturbing the other parts of my apparatus.l

The water-legs a are supportedby a doubleflanged grate-ring G, which issustained by bolts B3, secured to the flanged bottom Got' the ash-pit, the grate B being supported by the arrn B2. The sides of the 'ash-pit are formed by a sheet-iron wall B4, provided with a door of ordinary construction.

Supported by brackets H, extending upf ward from the nut or washer H and revolving thereon, is my double-shell casing C, consisting of two double-flanged rings G2 G3 and two sheet-iron cylinders, the rings G2 G2 being bolted together by rods C2 and the space between the sheet-iron cylinders being iilled or packed with a non-combustible and nonheat-conducting material, as asbestus, mineral Wool,fossil meal, &c., and being provided with a door-frame extending practically the entire length of the cylinders, in which are located doors C3. These doors C3 serve to aord access to the interior of the combustion-chamber D, and also to allow the pipes ct to be cleaned and the sectional sleeve F to be inspected, and as the double casing C revolves upon the brackets H access to any pipe or to any particular sectionof the sleeve may readily be obtained.

A single sheet-iron band O incloses the space outside of the water-legs @between the ash-pit B and double shell C, and a similar one A2 is located between the flanged rings Gr3 and G4 and extends around the body A of vthe generator. These sheet-iron bands are ordinarily provided with ears CL4, in order that the respective ends of the same may be fastened together after the double shell C has been set up in its proper place.

The generator A is provided with a steamoutlet pipe M and gage L, and -also with an I3', which is provided with a check-valve Q,

into one of the Water-legs a, from which it Hows into the body A of the generator. The three-way valve K causes the steam in the pipe N to be shut ott` when the water-supply pipe J and the reservoir E are united, and,

, on`the other hand, closes the connection bewhen steam is admitted thereto through the pipe N, in order to equalize the pressure in the generator-body A and reservoir E, the

pressure of the steam serving to close the check-valve Q.

As it is evident that many slight changes in the construction and relative arrangement of partsmight be resorted to without departing from the spirit and scope of my invention, I would have it understood that I do not restrict myself to the particular construction and arrangement of parts shown and described, but that I reserve the right to make such changes, and that Vhat I claimV asnew, and Vdesire to secure by Letters Patent, is-

l. In a generator, the combination, with a row of water-legs, of asectional sleeve F, provided with projections fsand grooves f4, substantially as described.

2. The combination, with a series of pipes a, of a sectional sleeve F, bolts f, and brackets ll, substantially described.

3. In a generator, an ash-pit constructed by means of a anged bottom and double-flanged grate-ring bolted together and provided with an external sheet-iron wall, substantially as described.

4. In a generator, a double-packed revolving casing consisting of two doub1e-tlanged rings bolted together and an outer and inner shell and intermediate packing,'substan tially as described.

5. In a generator, a revolving casing consisting ot' two double-flanged rings bolted together and an intermediate double-packed shell andprovided with a door-trame of practically the entire length ot the same, substantially as described.

(i. yIn a generator consisting of a body provided withl Waterllegs, two double anged rings bolted together and a revolving casing consisting of a double shell and intermediate packing and traveling on brackets attached to the water-legs, substantially as described. V 7. The combination, with a steam-generator andkwith a water-reservoir provided with a water-supply pipe and with a steam-pipe connecting the generator and reservoir, of a three-Way valve controlling the steam and water supply pipes, substantiallyas described. -In testimony of the foregoing specification I do hereby sign the same,in the city'ot New York, county and State of New York, this 18th day of March, A. D. 1891.v

ARTHUR F. MEAD. lVitnesses:

J. ODELL FowLER, Jr., B. FRANK THOMAS.

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